Control method and device of fuel cell system and fuel cell system

Abstract

The invention provides a control method and device of a fuel cell system and the fuel cell system, and relates to the field of fuel cell system control. Whether the hydrogen circulating pump generates accumulated water or not can be judged only by using the current value of the hydrogen circulating pump in the fuel cell system, and then the nitrogen discharge valve in the fuel cell system is controlled to prolong the circulating opening time of the valve to eliminate the accumulated water phenomenon, so that the accumulated water condition in the hydrogen circulating pump is monitored and treated; the problem that in the prior art, in the monitoring and processing process of the water accumulation condition of the hydrogen circulating pump, related implementation means are lacked is solved.

Description

Technical Field

[0001] The present invention relates to the field of fuel cell system control, and in particular to a control method and device for a fuel cell system and a fuel cell system. Background Art

[0002] The gas supplied in the hydrogen circulation path of the fuel cell system is hydrogen, and the power source of the supply process is mainly the hydrogen circulation pump. In order to ensure the operation of the fuel cell system, it is necessary to ensure that the hydrogen circulation pump is in normal working conditions. In fact, in low temperature scenarios such as -30 degrees to 0 degrees, the valve of the hydrogen circulation pump is prone to water accumulation and ice formation, causing the hydrogen circulation pump to fail to work normally. In severe cases, the fuel cell system may fail to shut down due to insufficient hydrogen supply. Therefore, it is critical to monitor and process the water accumulation in the hydrogen circulation pump, but the prior art lacks relevant implementation means, resulting in water accumulation and even ice formation in the hydrogen circulation pump, affecting the stability of the fuel cell system. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a control method, device and fuel cell system for a fuel cell system. The method can determine whether water accumulation occurs in the hydrogen circulation pump by only using the current value of the hydrogen circulation pump in the fuel cell system, and then control the nitrogen exhaust valve in the fuel cell system to increase the valve's circulation opening time to eliminate the water accumulation phenomenon, thereby realizing the monitoring of the water accumulation in the hydrogen circulation pump and processing the water accumulation situation, solving the above-mentioned problems existing in the prior art.

[0004] In a first aspect, an embodiment of the present invention provides a control method for a fuel cell system, the method being used to detect and process water accumulation in a hydrogen circulation pump in the fuel cell system; wherein an air inlet of the hydrogen circulation pump is connected to an air outlet of a water tank in the fuel cell system, a drain outlet of the water tank is connected to a preset drain outlet in the fuel cell system via a drain valve; an exhaust outlet of the hydrogen circulation pump is connected to a preset exhaust outlet in the fuel cell system via a nitrogen exhaust valve;

[0005] The method includes:

[0006] Controlling the fuel cell system to operate under a preset first operating condition parameter, and obtaining a first current value corresponding to the hydrogen circulation pump;

[0007] Calculating a first current difference between the first current value and a preset current calibration value, and obtaining a first duration during which the first current difference is greater than a preset difference threshold;

[0008] When the first duration is greater than a preset first time threshold, the fuel cell system is controlled to operate under a preset second operating condition parameter; wherein a second current density corresponding to the fuel cell stack in the second operating condition parameter is greater than a first current density corresponding to the fuel cell stack in the first operating condition parameter; a second nitrogen exhaust valve cycle opening duration corresponding to the second current density is greater than a first nitrogen exhaust valve cycle opening duration corresponding to the first current density; and a second nitrogen exhaust valve cycle closing duration corresponding to the second current density is equal to a first nitrogen exhaust valve cycle closing duration corresponding to the first current density.

[0009] In one embodiment, the step of controlling the fuel cell system to operate under a preset first operating parameter and obtaining a first current value corresponding to the hydrogen circulation pump includes:

[0010] Obtaining a first current density corresponding to the fuel cell stack in the first operating condition parameter, and obtaining a first speed value corresponding to the hydrogen circulation pump under the first current density, a first cycle opening time length and a first cycle closing time length of the nitrogen exhaust valve;

[0011] After controlling the fuel cell system to operate under the first current density, the first speed value, the first cycle on time and the first cycle off time, a first current value corresponding to the hydrogen circulation pump is obtained.

[0012] In one embodiment, the step of calculating a first current difference between a first current value and a preset current calibration value, and obtaining a first duration of time during which the first current difference is greater than a preset difference threshold, includes:

[0013] Determining a first current calibration value corresponding to a first current density and a first speed value;

[0014] monitoring a first current difference between the first current value and the first current calibration value in real time, and determining whether the first current difference is greater than a preset difference threshold;

[0015] When the first current difference is greater than the difference threshold, timing starts, and a first duration during which the first current difference is greater than the difference threshold is acquired in real time.

[0016] In one embodiment, when the first duration is greater than a preset first time threshold, the step of controlling the fuel cell system to operate under a preset second operating parameter includes:

[0017] Determine in real time whether the first duration is greater than a first time threshold;

[0018] If yes, then obtain a second current density corresponding to the fuel cell stack under the second operating condition parameter, determine a second cycle opening duration and a second cycle closing duration of the nitrogen exhaust valve corresponding to the second current density, and determine a second speed value of the hydrogen circulation pump corresponding to the second current density;

[0019] The fuel cell system is controlled to operate at a second current density, a second cycle on time, a second cycle off time and a second speed value; wherein the second speed value is greater than the first speed value.

[0020] In one embodiment, after controlling the fuel cell system to operate under the preset second operating parameters, the method further includes:

[0021] Obtaining a second current value corresponding to the hydrogen circulation pump;

[0022] Determining a second current calibration value corresponding to a second current density and a second rotational speed value;

[0023] Calculating a second current difference between the second current value and the second current calibration value, and obtaining a second duration during which the second current difference is greater than a preset difference threshold;

[0024] When the second duration is greater than a preset second time threshold, the fuel cell system is controlled to operate under a preset third operating condition parameter; wherein a third current density corresponding to the fuel cell stack in the third operating condition parameter is greater than a second current density corresponding to the fuel cell stack in the second operating condition parameter; a third nitrogen exhaust valve cycle opening duration corresponding to the third current density is greater than a second nitrogen exhaust valve cycle opening duration corresponding to the second current density; and a third nitrogen exhaust valve cycle closing duration corresponding to the third current density is equal to a second nitrogen exhaust valve cycle closing duration corresponding to the second current density.

[0025] In one embodiment, after controlling the fuel cell system to operate under the preset second operating parameters, the method further includes:

[0026] Obtaining the operating time of the fuel cell system under the second operating condition parameters;

[0027] When the running time is greater than a preset third time threshold, the step of obtaining a second current value corresponding to the hydrogen circulation pump is performed.

[0028] In one embodiment, after the steps of calculating the second current difference between the second current value and the second current calibration value, and obtaining a second duration for which the second current difference is greater than a preset difference threshold, the method further comprises:

[0029] When the second duration is not greater than a preset second time threshold, the fuel cell system is controlled to operate under the second operating parameters.

[0030] In one embodiment, after the steps of calculating a first current difference between the first current value and a preset current calibration value, and obtaining a first duration during which the first current difference is greater than a preset difference threshold, the method further comprises:

[0031] When the first duration is not greater than a preset first time threshold, the fuel cell system is controlled to operate under the first operating parameters.

[0032] In a second aspect, an embodiment of the present invention further provides a control device for a fuel cell system, the device being used to detect and process water accumulation in a hydrogen circulation pump in the fuel cell system; wherein the air inlet of the hydrogen circulation pump is connected to the air outlet of a water tank in the fuel cell system, the drain outlet of the water tank is connected to a preset drain outlet in the fuel cell system through a drain valve; the exhaust outlet of the hydrogen circulation pump is connected to a preset exhaust outlet in the fuel cell system through a nitrogen exhaust valve;

[0033] The device includes:

[0034] A first control module, used to control the fuel cell system to operate under a preset first operating parameter and obtain a first current value corresponding to the hydrogen circulation pump;

[0035] a second control module, configured to calculate a first current difference between the first current value and a preset current calibration value, and obtain a first duration during which the first current difference is greater than a preset difference threshold;

[0036] The third control module is used to control the fuel cell system to operate under a preset second operating parameter when the first duration is greater than a preset first time threshold; wherein a second current density corresponding to the fuel cell stack in the second operating parameter is greater than a first current density corresponding to the fuel cell stack in the first operating parameter; a second nitrogen exhaust valve cycle opening duration corresponding to the second current density is greater than a first nitrogen exhaust valve cycle opening duration corresponding to the first current density; and a second nitrogen exhaust valve cycle closing duration corresponding to the second current density is equal to a first nitrogen exhaust valve cycle closing duration corresponding to the first current density.

[0037] In a third aspect, an embodiment of the present invention further provides a fuel cell system, which comprises at least a hydrogen circulation path and a fuel cell stack;

[0038] The hydrogen circulation path includes: a hydrogen circulation pump, a water tank, a drain valve, a nitrogen exhaust valve and a hydrogen spray valve; the hydrogen is input into the air inlet of the hydrogen spray valve, and the air outlet of the hydrogen spray valve is connected to the anode inlet of the fuel cell stack; the anode outlet of the fuel cell stack is connected to the inlet of the water tank; the drain port of the water tank is connected to the water inlet of the drain valve; the drain port of the drain valve is connected to the preset drain port of the fuel cell system; the air outlet of the water tank is connected to the air inlet of the hydrogen circulation pump; the exhaust port of the hydrogen circulation pump is connected to the preset exhaust port of the fuel cell system; the air outlet of the hydrogen circulation pump is connected to the anode inlet of the fuel cell stack;

[0039] When performing water accumulation detection and treatment on a hydrogen circulation pump in a fuel cell system, the control method of the fuel cell system mentioned in the first aspect is adopted.

[0040] In a fourth aspect, an embodiment of the present invention further provides an electronic device, including a processor and a memory, wherein the memory stores computer executable instructions that can be executed by the processor, and the processor executes the computer executable instructions to implement the steps of the fuel cell system control method provided in the first aspect.

[0041] In a fifth aspect, an embodiment of the present invention further provides a storage medium, which stores computer executable instructions. When the computer executable instructions are called and executed by a processor, the computer executable instructions prompt the processor to implement the steps of the fuel cell system control method provided in the first aspect.

[0042] A control method, device and fuel cell system of a fuel cell system provided in an embodiment of the present invention are used to monitor and process the water accumulation of a hydrogen circulation pump in a fuel cell system. In a specific implementation process, the fuel cell system is first controlled to operate under a preset first operating parameter, and a first current value corresponding to the hydrogen circulation pump is obtained; then the first current difference between the first current value and the preset current calibration value is calculated, and the first duration of the first current difference being greater than a preset difference threshold is obtained; when the first duration is greater than the preset first time threshold, the fuel cell system is controlled to operate under a preset second operating parameter; wherein the second current density corresponding to the fuel cell stack in the second operating parameter is greater than the first current density corresponding to the fuel cell stack in the first operating parameter; the second nitrogen exhaust valve cycle opening time corresponding to the second current density is greater than the first nitrogen exhaust valve cycle opening time corresponding to the first current density; the second nitrogen exhaust valve cycle closing time corresponding to the second current density is equal to the first nitrogen exhaust valve cycle closing time corresponding to the first current density. The method can determine whether water is accumulated in the hydrogen circulation pump by only using the current value of the hydrogen circulation pump in the fuel cell system, and then control the nitrogen exhaust valve in the fuel cell system to increase the circulation opening time of the valve to eliminate the water accumulation phenomenon, thereby realizing the monitoring of the water accumulation in the hydrogen circulation pump and processing the water accumulation situation, solving the problem of the lack of relevant implementation means in the prior art in the process of monitoring and processing the water accumulation situation in the hydrogen circulation pump.

[0043] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 A flow chart of a first fuel cell system control method provided by an embodiment of the present invention;

[0047] Figure 2 A flowchart of step S101 in a fuel cell system control method provided by an embodiment of the present invention;

[0048] Figure 3 A flowchart of step S102 in a control method of a fuel cell system provided in an embodiment of the present invention;

[0049] Figure 4 A flowchart of step S103 in a fuel cell system control method provided by an embodiment of the present invention;

[0050] Figure 5 A flow chart of a fuel cell system control method provided in an embodiment of the present invention after controlling the fuel cell system to operate under a preset second operating condition parameter;

[0051] Figure 6 A flow chart after controlling a fuel cell system to operate under a preset second operating condition parameter in another fuel cell system control method provided by an embodiment of the present invention;

[0052] Figure 7 A flow chart after controlling the fuel cell system to operate under a preset second operating condition parameter in the third fuel cell system control method provided in an embodiment of the present invention;

[0053] Figure 8 A flow chart of another fuel cell system control method provided by an embodiment of the present invention;

[0054] Fig. 9 A schematic diagram of the structure of a control device for a fuel cell system provided by an embodiment of the present invention;

[0055] Fig.10 A schematic structural diagram of a fuel cell system provided by an embodiment of the present invention;

[0056] Fig.11 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention.

[0057] icon:

[0058] 910 - first control module; 920 - second control module; 930 - third control module;

[0059] 1010- fuel cell stack; 1020- hydrogen circulation pump; 1030- water tank; 1040- drain valve; 1050- nitrogen exhaust valve; 1060- hydrogen injection valve;

[0060] 101 - processor; 102 - memory; 103 - bus; 104 - communication interface. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described in combination with the embodiments below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] The gas supplied in the hydrogen circulation path of the fuel cell system is hydrogen, and the power source of the supply process is mainly the hydrogen circulation pump. In order to ensure the operation of the fuel cell system, it is necessary to ensure that the hydrogen circulation pump is in normal working conditions. In fact, in low temperature scenarios such as -30 degrees to 0 degrees, the valve of the hydrogen circulation pump is prone to water accumulation and ice formation, causing the hydrogen circulation pump to fail to work normally. In severe cases, the fuel cell system may fail to shut down due to insufficient hydrogen supply. Therefore, it is critical to monitor and process the water accumulation in the hydrogen circulation pump, but the prior art lacks relevant implementation means, resulting in water accumulation and even ice formation in the hydrogen circulation pump, affecting the stability of the fuel cell system. Based on this, the present invention provides a control method, device and fuel cell system for a fuel cell system. The method can determine whether water is accumulated in the hydrogen circulation pump by only using the current value of the hydrogen circulation pump in the fuel cell system, and then control the nitrogen exhaust valve in the fuel cell system to increase the circulation opening time of the valve to eliminate the water accumulation phenomenon, thereby realizing the monitoring of the water accumulation in the hydrogen circulation pump and processing of the water accumulation situation, solving the problem of the lack of relevant implementation means in the prior art in the process of monitoring and processing the water accumulation situation in the hydrogen circulation pump.

[0063] To facilitate understanding of this embodiment, a control method for a fuel cell system disclosed in an embodiment of the present invention is first described in detail. The method is used to detect and process water accumulation in a hydrogen circulation pump in a fuel cell system. The control method for the fuel cell system is as follows: Figure 1 As shown, including:

[0064] Step S101, controlling the fuel cell system to operate under a preset first operating parameter, and obtaining a first current value corresponding to a hydrogen circulation pump.

[0065] Under the first operating condition parameters, the fuel cell system controls the hydrogen to be input into the hydrogen circulation path and finally input into the fuel cell stack to generate electricity. The fuel cell stack performs the power generation process under the first operating condition parameters and discharges the generated wastewater and waste gas into the water tank. The function of the water tank is to separate gas and liquid, and the separated wastewater is discharged through the drain valve connected to the water tank; the waste gas separated by gas and liquid and the unreacted hydrogen separated by gas and liquid are transmitted to the hydrogen circulation pump, and the waste gas is discharged through the nitrogen exhaust valve connected to the hydrogen circulation pump, while the unreacted hydrogen is circulated to the hydrogen supply pipeline through the hydrogen circulation pump. The current parameter of the hydrogen circulation pump when working represents its working state, that is, the first current value.

[0066] Step S102, calculating a first current difference between the first current value and a preset current calibration value, and obtaining a first duration that the first current difference is greater than a preset difference threshold.

[0067] After the first current value is obtained, it can be determined whether water has accumulated in the hydrogen circulation pump according to its size. Specifically, when water has accumulated in the hydrogen circulation pump, the corresponding current value is different from the current value in the normal working state. Therefore, the corresponding current value under normal conditions can be used as the current calibration value according to demand, and the difference between the first current value and the current calibration value is calculated to determine whether the hydrogen circulation pump is in a state of water accumulation. Specifically, after obtaining the first current difference between the first current value and the current calibration value, the size of the first current difference is determined. When the first current difference is greater than the difference threshold, it indicates that the hydrogen circulation pump is in an abnormal state. At this time, the first duration of the first current difference greater than the difference threshold is obtained to determine whether the hydrogen circulation pump is in a state of water accumulation.

[0068] Step S103, when the first duration is greater than the preset first time threshold, the fuel cell system is controlled to operate under the preset second operating parameters; wherein the second current density corresponding to the fuel cell stack in the second operating parameters is greater than the first current density corresponding to the fuel cell stack in the first operating parameters; the second nitrogen exhaust valve cycle opening duration corresponding to the second current density is greater than the first nitrogen exhaust valve cycle opening duration corresponding to the first current density; the second nitrogen exhaust valve cycle closing duration corresponding to the second current density is equal to the first nitrogen exhaust valve cycle closing duration corresponding to the first current density.

[0069] When the first duration is greater than the preset first time threshold, it indicates that the hydrogen circulation pump is in a water accumulation state. At this time, the fuel cell system can be controlled to operate according to the second operating parameters. The second current density corresponding to the fuel cell stack under the second operating parameters must be greater than the first current density corresponding to the fuel cell stack in the first operating parameters. Moreover, the second nitrogen discharge valve cycle opening duration corresponding to the second current density is greater than the first nitrogen discharge valve cycle opening duration corresponding to the first current density; the second nitrogen discharge valve cycle closing duration corresponding to the second current density is equal to the first nitrogen discharge valve cycle closing duration corresponding to the first current density, so that the cycle opening duration of the hydrogen circulation pump valve is increased, thereby eliminating the water accumulation in the hydrogen circulation pump.

[0070] In one embodiment, the fuel cell system is controlled to operate under a preset first operating parameter, and a first current value corresponding to the hydrogen circulation pump is obtained in step S101, such as Figure 2 As shown, including:

[0071] Step S201, obtaining a first current density corresponding to the fuel cell stack in the first operating condition parameter, and obtaining a first speed value corresponding to the hydrogen circulation pump under the first current density, a first cycle opening time length and a first cycle closing time length of the first nitrogen exhaust valve;

[0072] Step S202, after controlling the fuel cell system to operate under the first current density, the first speed value, the first cycle on time and the first cycle off time, obtain a first current value corresponding to the hydrogen circulation pump.

[0073] Specifically, the first operating condition parameter includes at least the first current density corresponding to the fuel cell stack, and the first speed value corresponding to the corresponding hydrogen circulation pump is obtained based on the first current density, and the first cycle opening time and the first cycle closing time of the first nitrogen exhaust valve are obtained. Then, after the fuel cell system is controlled to operate stably under the first current density, the first speed value, and the first cycle opening time and the first cycle closing time of the first nitrogen exhaust valve, the first current value corresponding to the hydrogen circulation pump is obtained. The above process can be performed with reference to Table 1.

[0074] First current density / (A / cm2) 0.1 0.2 0.3 … First speed value / rpm 1000 2000 3000 … First current value / A Measured value 1 Measured value 2 Measured value 3 …

[0075] Table 1

[0076] In one embodiment, the step S102 of calculating a first current difference between a first current value and a preset current calibration value, and obtaining a first duration of time during which the first current difference is greater than a preset difference threshold value, is as follows: Figure 3 As shown, including:

[0077] Step S301, determining a first current calibration value corresponding to a first current density and a first speed value;

[0078] Step S302, monitoring a first current difference between a first current value and a first current calibration value in real time, and determining whether the first current difference is greater than a preset difference threshold;

[0079] Step S303, when the first current difference is greater than the difference threshold, start timing, and obtain in real time a first duration during which the first current difference is greater than the difference threshold.

[0080] The operating parameters between the first current calibration value and the first current value are the same. For example, the first current value is obtained according to the first current density and the first speed value in Table 1. Therefore, the current calibration value is also obtained according to the first current density and the first speed value in Table 1. The specific details can be found in Table 2.

[0081] First current density / (A / cm2) 0.1 0.2 0.3 … First speed value / rpm 1000 2000 3000 … The first current calibration value / A Calibration value 1 Calibration value 2 Calibration value 3 … Nitrogen exhaust valve opening and closing time On for 0.1s, Off for 1s On for 0.2s, Off for 1s Open 0.3s, close 1s

[0082] Table 2

[0083] The first current calibration value in Table 2 represents the corresponding relationship between the speed of the hydrogen circulation pump and the working current at various operating points of the fuel cell system under normal conditions. In actual processing, the data in Table 2 can be saved to the relevant storage unit of the fuel cell system for retrieval and use at any time.

[0084] The first current density and the first speed value in Table 2 are consistent with the first current density and the first speed value in Table 1, so the corresponding first current calibration value can correspond to the measured first current value, by calculating the first current difference between the first current value and the first current calibration value, and judging whether the first current difference is greater than the preset difference threshold. In the actual calculation process, the first current difference may be negative, in which case it needs to be converted into a positive number, and the absolute value of the first current difference is used to compare with the difference threshold.

[0085] When the current difference is greater than the difference threshold, the timing starts, and the duration is recorded as the first duration. The subsequent steps determine whether the hydrogen circulation pump is in a water accumulation state by the first duration. In one embodiment, when the first duration is greater than the preset first time threshold, the step S103 of controlling the fuel cell system to operate under the preset second operating condition parameters is as follows: Figure 4 As shown, including:

[0086] Step S401, determining in real time whether the first duration is greater than a first time threshold;

[0087] Step S402: if yes, obtain a second current density corresponding to the fuel cell stack under the second operating condition parameter, determine a second cycle opening duration and a second cycle closing duration of the nitrogen exhaust valve corresponding to the second current density, and determine a second speed value of the hydrogen circulation pump corresponding to the second current density;

[0088] Step S403, controlling the fuel cell system to operate at a second current density, a second cycle on time, a second cycle off time and a second speed value; wherein the second speed value is greater than the first speed value.

[0089] According to the first operating condition parameters in the aforementioned embodiment, the above process can be described with reference to the first current difference in Table 3.

[0090] <![CDATA[First current density / (A / cm 2 )]]> 0.1 0.2 0.3 … First speed value / rpm 1000 2000 3000 … First current difference / A Measured value 1 - Calibration value 1 Measured value 2 - Calibrated value 2 Measured value 3 - Calibrated value 3 …

[0091] Table 3

[0092] The first current difference is the absolute value of the difference between the measured value corresponding to the first current value and the first current calibration value. When the first current difference is greater than the difference threshold, it is determined whether the corresponding first duration is greater than the preset first time threshold. If so, it is determined that water has accumulated in the nitrogen exhaust valve at the bottom of the hydrogen circulation pump. In a specific scenario, when the first current difference is monitored to be greater than 0.1A and the duration is greater than 5s, it is considered that water has accumulated in the nitrogen exhaust valve of the hydrogen circulation pump.

[0093] When it is determined that water has accumulated in the nitrogen exhaust valve of the hydrogen circulation pump, the fuel cell system will be controlled to operate at the second current density, the second cycle opening time, the second cycle closing time and the second speed value. Specifically, the second current density is greater than the first current density; the second nitrogen exhaust valve opening time is greater than the first nitrogen exhaust valve opening time; the second speed value is greater than the first speed value; so that the cycle opening time of the hydrogen circulation pump valve is increased, thereby eliminating the water accumulation in the hydrogen circulation pump.

[0094] In one embodiment, after controlling the fuel cell system to operate under the preset second operating parameters, Figure 5 As shown, the method also includes:

[0095] Step S501, obtaining a second current value corresponding to the hydrogen circulation pump;

[0096] Step S502, determining a second current calibration value corresponding to a second current density and a second speed value;

[0097] Step S503, calculating a second current difference between the second current value and the second current calibration value, and obtaining a second duration that the second current difference is greater than a preset difference threshold;

[0098] Step S504, when the second duration is greater than the preset second time threshold, the fuel cell system is controlled to operate under the preset third operating parameters; wherein, the third current density corresponding to the fuel cell stack in the third operating parameters is greater than the second current density corresponding to the fuel cell stack in the second operating parameters; the third nitrogen exhaust valve cycle opening duration corresponding to the third current density is greater than the second nitrogen exhaust valve cycle opening duration corresponding to the second current density; the third nitrogen exhaust valve cycle closing duration corresponding to the third current density is equal to the second nitrogen exhaust valve cycle closing duration corresponding to the second current density.

[0099] After the fuel cell system is controlled to operate under the preset second operating parameters, the cycle opening time of the hydrogen circulation pump valve is increased, and the corresponding working current of the hydrogen circulation pump is changed. Therefore, after obtaining the second current value corresponding to the hydrogen circulation pump, the second current calibration value corresponding to the second current density and the second speed value is determined, and the second current difference between the second current value and the second current calibration value is calculated. When the second duration is greater than the preset second time threshold, it indicates that the hydrogen fuel cell system under the second operating parameters cannot meet the water removal requirements of the hydrogen circulation pump, and the fuel cell system needs to be controlled to operate under the preset third operating parameters. The third current density corresponding to the fuel cell stack in the third operating parameters is greater than the second current density corresponding to the fuel cell stack in the second operating parameters, and the third nitrogen valve cycle opening time corresponding to the third current density is greater than the second nitrogen valve cycle opening time corresponding to the second current density; the third nitrogen valve cycle closing time corresponding to the third current density is equal to the second nitrogen valve cycle closing time corresponding to the second current density. Thereby further increasing the cycle opening time of the hydrogen circulation pump valve, thereby eliminating the water accumulation of the hydrogen circulation pump.

[0100] In one embodiment, after controlling the fuel cell system to operate under the preset second operating parameters, Figure 6 As shown, the method also includes:

[0101] Step S601, obtaining the operating time of the fuel cell system under the second operating condition parameters;

[0102] Step S602, when the running time is greater than a preset third time threshold, executing the step of obtaining a second current value corresponding to the hydrogen circulation pump.

[0103] The third time threshold can be understood as the control time of the water accumulation treatment process. Since the fuel cell system processes the water accumulation of the hydrogen circulation pump under the second operating parameters at this time, the duration of the treatment process is controlled by the second time threshold. For example, the third time threshold is 30s. After the fuel cell system has been running for 30 seconds under the second operating parameters, that is, after completing the 30-second water removal process, the subsequent steps are executed.

[0104] In one embodiment, another flowchart of controlling the fuel cell system to operate under the preset second operating parameters is as follows: Figure 7 As shown, including:

[0105] Step S701, obtaining a second current value corresponding to the hydrogen circulation pump;

[0106] Step S702, determining a second current calibration value corresponding to a second current density and a second speed value;

[0107] Step S703, calculating a second current difference between the second current value and the second current calibration value, and obtaining a second duration that the second current difference is greater than a preset difference threshold;

[0108] Step S704: when the second duration is not greater than a preset second time threshold, the fuel cell system is controlled to operate under second operating parameters.

[0109] After the fuel cell system operates under the preset second operating parameters, when the second duration is not greater than the preset second time threshold, it indicates that the hydrogen fuel cell system under the second operating parameters can meet the water removal requirements of the hydrogen circulation pump. At this time, the fuel cell system is controlled to maintain operation under the second operating parameters.

[0110] In one embodiment, a flow chart of another method for controlling a fuel cell system is as follows: Figure 8 As shown, the method also includes:

[0111] Step S801, controlling the fuel cell system to operate under a preset first operating parameter, and obtaining a first current value corresponding to a hydrogen circulation pump;

[0112] Step S802, calculating a first current difference between a first current value and a preset current calibration value, and obtaining a first duration during which the first current difference is greater than a preset difference threshold;

[0113] Step S803: when the first duration is not greater than a preset first time threshold, the fuel cell system is controlled to operate under the first operating parameters.

[0114] After the fuel cell system operates under the preset first operating parameters, when the first duration is not greater than the preset first time threshold, it indicates that the hydrogen fuel cell system under the first operating parameters can meet the water removal requirements of the hydrogen circulation pump. At this time, the fuel cell system is controlled to maintain operation under the first operating parameters.

[0115] In a specific scenario, the control method process of the above fuel cell system is shown in Table 4.

[0116] Actual current density / (A / cm2) 0.1 0.1 0.1 … Hydrogen pump speed / rpm 1000 2000 3000 … Nitrogen exhaust valve opening and closing time On for 0.1s, Off for 1s On for 0.2s, Off for 1s Open 0.3s, close 1s Hydrogen pump current difference / A Measured value 1 - Calibration value 1 Measured value 2 - Calibrated value 2 Measured value 3 - Calibrated value 3 … Is there water accumulation? yes yes no

[0117] Table 4

[0118] First, obtain the current difference of the hydrogen circulation pump corresponding to the first operating condition parameter. The speed of the hydrogen circulation pump under the first operating condition parameter is 1000rpm, and the opening and closing time of the nitrogen exhaust valve is 0.1s on and 1s off. Under this operating condition, obtain the difference between the measured value 1 and the calibrated value 1. If the difference is greater than 0.1A and lasts for more than 5s, it is determined that water accumulates at the bottom of the hydrogen circulation pump. As can be seen from Table 4, the current density of the fuel cell stack is 0.1. At this time, the speed of the hydrogen circulation pump and the opening and closing time of the nitrogen exhaust valve corresponding to the current density of 0.2 are used as the operating parameters of the current fuel cell system. At this time, the speed of the hydrogen circulation pump is 2000rpm, and the opening and closing time of the nitrogen exhaust valve is 0.2s on and 1s off. After 30s, obtain the difference between the measured value 2 and the calibrated value 2 under the second operating condition parameter, and determine whether the difference is greater than 0.1A and lasts for more than 5s. If it is still not satisfied, refer to Table 4 and use the hydrogen circulation pump speed and the cycle opening time of the nitrogen exhaust valve corresponding to the current density of 0.3 as the operating parameters of the current fuel cell system, and finally complete the treatment of the accumulated water.

[0119] It can be seen that from the control method of the above-mentioned fuel cell system provided in the embodiment of the present invention, it can be known that this method can determine whether water accumulation occurs in the hydrogen circulation pump by only using the current value of the hydrogen circulation pump in the fuel cell system, and then control the nitrogen exhaust valve in the fuel cell system to increase the circulation opening time of the valve to eliminate the water accumulation phenomenon, thereby realizing the monitoring of the water accumulation in the hydrogen circulation pump and processing of the water accumulation situation, which solves the problem of the lack of relevant implementation means in the prior art in the process of monitoring and processing the water accumulation situation in the hydrogen circulation pump.

[0120] For the control method of the fuel cell system provided in the aforementioned embodiment, an embodiment of the present invention provides a control device for the fuel cell system, which is used to detect and process the accumulated water in the hydrogen circulation pump in the fuel cell system; wherein, the air inlet of the hydrogen circulation pump is connected to the air outlet of the water tank in the fuel cell system, and the drain outlet of the water tank is connected to the preset drain outlet in the fuel cell system through a drain valve; and the exhaust port of the hydrogen circulation pump is connected to the preset exhaust port in the fuel cell system through a nitrogen exhaust valve.

[0121] like Fig. 9 As shown, the control device of the fuel cell system includes:

[0122] A first control module 910 is used to control the fuel cell system to operate under a preset first operating parameter and obtain a first current value corresponding to the hydrogen circulation pump;

[0123] The second control module 920 is used to calculate a first current difference between the first current value and a preset current calibration value, and obtain a first duration that the first current difference is greater than a preset difference threshold;

[0124] The third control module 930 is used to control the fuel cell system to operate under a preset second operating parameter when the first duration is greater than a preset first time threshold; wherein the second current density corresponding to the fuel cell stack in the second operating parameter is greater than the first current density corresponding to the fuel cell stack in the first operating parameter; the second nitrogen exhaust valve cycle opening duration corresponding to the second current density is greater than the first nitrogen exhaust valve cycle opening duration corresponding to the first current density; and the second nitrogen exhaust valve cycle closing duration corresponding to the second current density is equal to the first nitrogen exhaust valve cycle closing duration corresponding to the first current density.

[0125] The control device of the fuel cell system provided in the embodiment of the present invention can determine whether water is accumulated in the hydrogen circulation pump by only using the current value of the hydrogen circulation pump in the fuel cell system during the process of removing water from the hydrogen circulation pump in the fuel cell system, and then control the nitrogen exhaust valve in the fuel cell system to increase the circulation opening time of the valve to eliminate the water accumulation phenomenon, thereby realizing the monitoring of the water accumulation in the hydrogen circulation pump and processing the water accumulation situation, solving the problem of the lack of relevant implementation means in the prior art in the process of monitoring and processing the water accumulation situation in the hydrogen circulation pump.

[0126] The control device for the fuel cell system provided in the embodiment of the present invention has the same implementation principle and technical effects as those of the aforementioned fuel cell system control method embodiment. For the sake of brief description, for matters not mentioned in the device embodiment, reference may be made to the corresponding contents in the aforementioned fuel cell system control method embodiment.

[0127] This embodiment also provides a fuel cell system, such as Fig.10 As shown, the fuel cell system at least includes a hydrogen circulation path and a fuel cell stack 1010;

[0128] Among them, the hydrogen circulation path includes: a hydrogen circulation pump 1020, a water tank 1030, a drain valve 1040, a nitrogen exhaust valve 1050 and a hydrogen spray valve 1060; hydrogen is input into the air inlet of the hydrogen spray valve 1060, and the air outlet of the hydrogen spray valve 1060 is connected to the anode inlet of the fuel cell stack 1010; the anode outlet of the fuel cell stack 1010 is connected to the inlet of the water tank 1030; the drain outlet of the water tank 1030 is connected to the water inlet of the drain valve 1040; the drain outlet of the drain valve 1040 is connected to the preset drain outlet of the fuel cell system; the air outlet of the water tank 1030 is connected to the air inlet of the hydrogen circulation pump 1020; the exhaust port of the hydrogen circulation pump 1020 is connected to the preset exhaust port of the fuel cell system; the air outlet of the hydrogen circulation pump 1020 is connected to the anode inlet of the fuel cell stack 1010.

[0129] When performing water accumulation detection and treatment on the hydrogen circulation pump 1020 in the fuel cell system, the control method of the fuel cell system mentioned in the above embodiment is adopted.

[0130] This embodiment also provides an electronic device. The structural diagram of the electronic device is as follows: Fig.11 As shown, the device includes a processor 101 and a memory 102; wherein the memory 102 is used to store one or more computer instructions, and the one or more computer instructions are executed by the processor to implement the steps of the control method of the above-mentioned fuel cell system.

[0131] Fig.11 The electronic device shown further includes a bus 103 and a communication interface 104 , and the processor 101 , the communication interface 104 and the memory 102 are connected via the bus 103 .

[0132] The memory 102 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage. The bus 103 may be an ISA bus, a PCI bus, or an EISA bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.11 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0133] The communication interface 104 is used to connect to at least one user terminal and other network units through a network interface, and send the encapsulated IPv4 message or IPv4 message to the user terminal through the network interface.

[0134] The processor 101 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 101. The above processor 101 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The disclosed methods, steps and logic block diagrams in the embodiments of the present disclosure can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in conjunction with the embodiments of the present disclosure can be directly embodied as a hardware decoding processor for execution, or a combination of hardware and software modules in the decoding processor for execution. The software module may be located in a storage medium mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 102, and the processor 101 reads the information in the memory 102 and completes the steps of the method of the above embodiment in combination with its hardware.

[0135] An embodiment of the present invention further provides a storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the control method of the fuel cell system mentioned in the above embodiment are executed.

[0136] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0137] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0138] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0139] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0140] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A control method for a fuel cell system, characterized in that: The method is used to detect and process water accumulation in a hydrogen circulation pump in a fuel cell system; wherein the air inlet of the hydrogen circulation pump is connected to the air outlet of a water tank in the fuel cell system, and the drain outlet of the water tank is connected to a preset drain outlet in the fuel cell system through a drain valve; and the exhaust outlet of the hydrogen circulation pump is connected to a preset exhaust outlet in the fuel cell system through a nitrogen exhaust valve. The method comprises: Controlling the fuel cell system to operate under a preset first operating parameter, and obtaining a first current value corresponding to the hydrogen circulation pump; Calculating a first current difference between the first current value and a preset current calibration value, and obtaining a first duration during which the first current difference is greater than a preset difference threshold; When the first duration is greater than a preset first time threshold, the fuel cell system is controlled to operate under a preset second operating parameter; wherein a second current density corresponding to the fuel cell stack in the second operating parameter is greater than a first current density corresponding to the fuel cell stack in the first operating parameter; a second nitrogen exhaust valve cycle opening duration corresponding to the second current density is greater than a first nitrogen exhaust valve cycle opening duration corresponding to the first current density; and a second nitrogen exhaust valve cycle closing duration corresponding to the second current density is equal to a first nitrogen exhaust valve cycle closing duration corresponding to the first current density.

2. The control method of the fuel cell system according to claim 1, characterized in that: The step of controlling the fuel cell system to operate under a preset first operating parameter and obtaining a first current value corresponding to the hydrogen circulation pump includes: Obtaining the first current density corresponding to the fuel cell stack in the first operating condition parameter, and obtaining a first speed value corresponding to the hydrogen circulation pump, a first cycle opening time length and a first cycle closing time length of the nitrogen exhaust valve under the first current density; After controlling the fuel cell system to operate under the first current density, the first speed value, the first cycle on time and the first cycle off time, a first current value corresponding to the hydrogen circulation pump is obtained.

3. The control method of the fuel cell system according to claim 2, characterized in that: The step of calculating a first current difference between the first current value and a preset current calibration value, and obtaining a first duration during which the first current difference is greater than a preset difference threshold, comprises: Determining a first current calibration value corresponding to the first current density and the first speed value; monitoring a first current difference between the first current value and the first current calibration value in real time, and determining whether the first current difference is greater than a preset difference threshold; When the first current difference is greater than the difference threshold, timing starts, and the first duration during which the first current difference is greater than the difference threshold is acquired in real time.

4. The control method of the fuel cell system according to claim 3, characterized in that: The step of controlling the fuel cell system to operate under a preset second operating condition parameter when the first duration is greater than a preset first time threshold comprises: Determine in real time whether the first duration is greater than the first time threshold; If yes, then obtaining a second current density corresponding to the fuel cell stack under the second operating condition parameter, determining a second cycle opening duration and a second cycle closing duration of the nitrogen exhaust valve corresponding to the second current density, and determining a second speed value of the hydrogen circulation pump corresponding to the second current density; The fuel cell system is controlled to operate under the second current density, the second cycle on time, the second cycle off time and the second speed value; wherein the second speed value is greater than the first speed value.

5. The control method of the fuel cell system according to claim 4, characterized in that: After controlling the fuel cell system to operate under the preset second operating parameters, the method further includes: Obtaining a second current value corresponding to the hydrogen circulation pump; Determining a second current calibration value corresponding to the second current density and the second speed value; Calculating a second current difference between the second current value and the second current calibration value, and obtaining a second duration during which the second current difference is greater than a preset difference threshold; When the second duration is greater than a preset second time threshold, the fuel cell system is controlled to operate under a preset third operating parameter; wherein a third current density corresponding to the fuel cell stack in the third operating parameter is greater than a second current density corresponding to the fuel cell stack in the second operating parameter; a third nitrogen exhaust valve cycle opening duration corresponding to the third current density is greater than a second nitrogen exhaust valve cycle opening duration corresponding to the second current density; and a third nitrogen exhaust valve cycle closing duration corresponding to the third current density is equal to a second nitrogen exhaust valve cycle closing duration corresponding to the second current density.

6. The control method of the fuel cell system according to claim 5, characterized in that: After controlling the fuel cell system to operate under the preset second operating parameters, the method further includes: Obtaining the operating time of the fuel cell system under the second operating condition parameters; When the operating time is greater than a preset third time threshold, the step of obtaining a second current value corresponding to the hydrogen circulation pump is performed.

7. The control method of the fuel cell system according to claim 5, characterized in that: After the steps of calculating a second current difference between the second current value and the second current calibration value, and obtaining a second duration during which the second current difference is greater than a preset difference threshold, the method further includes: When the second duration is not greater than a preset second time threshold, the fuel cell system is controlled to operate under the second operating parameters.

8. The control method of the fuel cell system according to claim 1, characterized in that: After the steps of calculating a first current difference between the first current value and a preset current calibration value, and obtaining a first duration during which the first current difference is greater than a preset difference threshold, the method further includes: When the first duration is not greater than a preset first time threshold, the fuel cell system is controlled to operate under the first operating parameters.

9. A control device for a fuel cell system, characterized in that: The device is used to detect and process water accumulation in a hydrogen circulation pump in a fuel cell system; wherein the air inlet of the hydrogen circulation pump is connected to the air outlet of a water tank in the fuel cell system, and the drain outlet of the water tank is connected to a preset drain outlet in the fuel cell system through a drain valve; and the exhaust outlet of the hydrogen circulation pump is connected to a preset exhaust outlet in the fuel cell system through a nitrogen exhaust valve. The device comprises: a first control module, used to control the fuel cell system to operate under a preset first operating parameter and obtain a first current value corresponding to the hydrogen circulation pump; a second control module, configured to calculate a first current difference between the first current value and a preset current calibration value, and obtain a first duration during which the first current difference is greater than a preset difference threshold; A third control module is used to control the fuel cell system to operate under a preset second operating parameter when the first duration is greater than a preset first time threshold; wherein a second current density corresponding to the fuel cell stack in the second operating parameter is greater than the first current density corresponding to the fuel cell stack in the first operating parameter; a second nitrogen exhaust valve cycle opening duration corresponding to the second current density is greater than a first nitrogen exhaust valve cycle opening duration corresponding to the first current density; and a second nitrogen exhaust valve cycle closing duration corresponding to the second current density is equal to a first nitrogen exhaust valve cycle closing duration corresponding to the first current density.

10. A fuel cell system, characterized in that: The fuel cell system at least includes a hydrogen circulation path and a fuel cell stack; Wherein, the hydrogen circulation path comprises: a hydrogen circulation pump, a water tank, a drain valve, a nitrogen exhaust valve and a hydrogen spray valve; the air inlet of the hydrogen spray valve inputs hydrogen, and the air outlet of the hydrogen spray valve is connected to the anode inlet of the fuel cell stack; the anode outlet of the fuel cell stack is connected to the inlet of the water tank; the drain outlet of the water tank is connected to the water inlet of the drain valve; the drain outlet of the drain valve is connected to the preset drain outlet of the fuel cell system; the air outlet of the water tank is connected to the air inlet of the hydrogen circulation pump; the exhaust port of the hydrogen circulation pump is connected to the preset exhaust port of the fuel cell system; the air outlet of the hydrogen circulation pump is connected to the anode inlet of the fuel cell stack; When performing water accumulation detection and treatment on the hydrogen circulation pump in the fuel cell system, the control method of the fuel cell system according to any one of claims 1 to 8 is adopted.

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